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Benefit Plans - Summary of Information about Stock Options Outstanding and Exercisable (Details)	12 Months Ended
	Oct. 31, 2017 $ / shares shares
Share based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number outstanding | shares	309,950
Options Outstanding, Weighted Average Remaining Contractual Life	6 years
Options Outstanding, Weighted Average Exercise Price	$ 23.81
Options Exercisable, Number exercisable | shares	280,664
Options Exercisable, Weighted Average Exercise Price	$ 26.00
$0.00 — $3.23 [Member]
Share based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Range Limit	0.00
Range of Exercise Prices, Upper Range Limit	$ 3.23
Options Outstanding, Number outstanding | shares	103,819
Options Outstanding, Weighted Average Remaining Contractual Life	9 years 4 months 24 days
Options Outstanding, Weighted Average Exercise Price	$ 1.50
Options Exercisable, Number exercisable | shares	77,865
Options Exercisable, Weighted Average Exercise Price	$ 1.50
$3.24 — $61.20 [Member]
Share based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Range Limit	3.24
Range of Exercise Prices, Upper Range Limit	$ 61.20
Options Outstanding, Number outstanding | shares	165,164
Options Outstanding, Weighted Average Remaining Contractual Life	5 years 2 months 12 days
Options Outstanding, Weighted Average Exercise Price	$ 18.72
Options Exercisable, Number exercisable | shares	161,832
Options Exercisable, Weighted Average Exercise Price	$ 18.86
$61.21 — $119.04 [Member]
Share based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Range Limit	61.21
Range of Exercise Prices, Upper Range Limit	$ 119.04
Options Outstanding, Number outstanding | shares	40,833
Options Outstanding, Weighted Average Remaining Contractual Life	3 months 18 days
Options Outstanding, Weighted Average Exercise Price	$ 100.78
Options Exercisable, Number exercisable | shares	40,833
Options Exercisable, Weighted Average Exercise Price	$ 100.78
$119.05 — $176.88 [Member]
Share based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Range Limit	119.05
Range of Exercise Prices, Upper Range Limit	$ 176.88
Options Outstanding, Number outstanding | shares	134
Options Outstanding, Weighted Average Remaining Contractual Life	7 months 6 days
Options Outstanding, Weighted Average Exercise Price	$ 121.56
Options Exercisable, Number exercisable | shares	134
Options Exercisable, Weighted Average Exercise Price	$ 121.56

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- Definition

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(iii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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